EP3863569B1 - Tap-in instrument - Google Patents

Tap-in instrument Download PDF

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Publication number
EP3863569B1
EP3863569B1 EP19786747.6A EP19786747A EP3863569B1 EP 3863569 B1 EP3863569 B1 EP 3863569B1 EP 19786747 A EP19786747 A EP 19786747A EP 3863569 B1 EP3863569 B1 EP 3863569B1
Authority
EP
European Patent Office
Prior art keywords
housing
sleeve
firing pin
tap
striker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19786747.6A
Other languages
German (de)
French (fr)
Other versions
EP3863569A1 (en
Inventor
Ulrike Müller
Jan Philippe KRETZER
Klaus NOTARBARTOLO
Robert LINGSLEBE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endocon GmbH
Universitaet Heidelberg
Universitaetsklinikum Heidelberg
Original Assignee
Endocon GmbH
Universitaet Heidelberg
Universitaetsklinikum Heidelberg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endocon GmbH, Universitaet Heidelberg, Universitaetsklinikum Heidelberg filed Critical Endocon GmbH
Publication of EP3863569A1 publication Critical patent/EP3863569A1/en
Application granted granted Critical
Publication of EP3863569B1 publication Critical patent/EP3863569B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2/4609—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of acetabular cups
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/92—Impactors or extractors, e.g. for removing intramedullary devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4637—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for connecting or disconnecting two parts of a prosthesis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/92—Impactors or extractors, e.g. for removing intramedullary devices
    • A61B2017/922—Devices for impaction, impact element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
    • A61B17/92—Impactors or extractors, e.g. for removing intramedullary devices
    • A61B2017/922—Devices for impaction, impact element
    • A61B2017/924—Impact element driving means
    • A61B2017/925—Impact element driving means a spring
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/30556—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting thickness
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30565—Special structural features of bone or joint prostheses not otherwise provided for having spring elements
    • A61F2002/30566—Helical springs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
    • A61F2002/30649—Ball-and-socket joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4625—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
    • A61F2002/4625—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use
    • A61F2002/4627—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof with relative movement between parts of the instrument during use with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4681—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor by applying mechanical shocks, e.g. by hammering

Definitions

  • the invention relates to an impaction instrument for joining prosthetic implants, comprising a housing which accommodates a firing pin, a first spring element being assigned to the firing pin, the firing pin being fixed in the housing by means of a locking device, the first spring element holding the firing pin after loosening the locking device accelerates in the direction of a hammer and initiates an impulse in the hammer.
  • Such an impact instrument is from DE 20 2006 000 845 U1 known.
  • the impact instrument is mainly used to attach an implant part, for example a joint ball, to a conical clamping pin of another implant part.
  • the impaction instrument known from the prior art enables a predetermined impulse to be exerted, which depends almost exclusively on the spring force of the spring integrated in the impaction instrument.
  • the invention is based on the object of providing an impaction instrument which, with simple handling, enables a reproducible application of impulses to an implant part to be joined.
  • the impaction instrument according to the invention for joining prosthetic implants comprises a housing which accommodates a firing pin, a first spring element assigned to the firing pin, a triggering device and at least partially a striking piece, with the striking piece protruding from the housing on one end face, with the triggering device between a fixing position and a release position, wherein the firing pin is spaced apart from the firing pin in the fixing position, the triggering device automatically moving from the fixing position into the release position when the firing pin moves axially into the housing, in order to release the firing pin after the release position has been reached, so that it is accelerated by the first spring element in the direction of the hammer.
  • the firing pin is triggered automatically depending on the position of the firing piece relative to the housing.
  • a release lever, a push button or the like it is not necessary for a release lever, a push button or the like to be actuated manually.
  • the user places the hammer on the prosthetic implant to be joined and moves the housing in the axial direction towards the prosthetic implant.
  • the hammer moves into the housing, with the triggering device being moved from the fixing position to the release position, with the firing pin being released after the release position has been reached and being accelerated by the first spring element in the direction of the hammer in order to generate an impulse there to bring in the hammer.
  • the trigger device is only in the release position moving as the hammer moves into the housing ensures that the impactor, or hammer, is firmly and securely seated on the prosthetic implant. It is advantageous here that the impulse introduced by the firing pin into the hammer is transmitted completely from the hammer to the prosthetic implant.
  • the force that acts on the prosthetic implant during the movement of the impaction instrument or the triggering device between the fixing position and the release position is always the same. This makes it possible to introduce a reproducible impulse into the prosthetic implant, with the impulse corresponding exactly to the impulse required for joining.
  • the impaction instrument according to the invention is therefore particularly suitable for joining cone connections or cone press fits, which are frequently used in particular in the field of endoprosthetics, for example in hip prostheses.
  • a ceramic or metal ball is placed on a cone of a hip implant. So far, the ball has usually been attached to the implant with a single blow of a hammer.
  • the impact instrument according to the invention is particularly advantageous because the impact piece is prestressed on the element to be fastened in order to release the impact instrument. After reaching the release position, the firing pin will be abrupt released and an impulse with a very short impulse duration is introduced into the components of the implant in order to join the connection.
  • the triggering device can have a first sleeve which is arranged in an axially movable manner in the housing and accommodates the firing pin, the first sleeve having at least one opening on the circumference, with at least one blocking body being arranged in the opening.
  • the triggering device is accommodated in the housing and assigned directly to the firing pin.
  • At least one recess can be made in the firing pin, which recess accommodates the blocking body in the fixing position.
  • the locking body accommodated in the depression causes the firing pin to be fixed in the fixing position relative to the first sleeve.
  • the indentation can be designed in the form of a circumferential groove which is introduced into the circumference of the firing pin.
  • a circumferential groove is easy to produce and, on the other hand, it allows the firing pin to rotate. This can prevent the firing pin from jamming in the first sleeve.
  • the locking body In the fixing position, the locking body can rest against the inner wall of the housing, with the inner diameter of the housing being selected such that the locking body is held in the opening in the first sleeve and in the recess of the firing pin, thereby locking the firing pin relative to the first sleeve is.
  • the housing has a through-bore, the inner diameter of the through-bore being selected in this embodiment such that the outer wall of the first sleeve rests against the inner wall of the bore.
  • the blocking bodies are preferably designed in the form of balls, with the first sleeve having a plurality of openings, preferably three openings distributed over the circumference in the form of bores, which accommodate the spherical blocking bodies.
  • Spherical blocking bodies are particularly advantageous since they can roll on the inner wall of the housing and do not tend to jam.
  • the hammer can axially displace the first sleeve and the firing pin locked to the first sleeve within the housing as the hammer translates axially into the housing.
  • a force is applied to the impaction instrument, causing the impact piece to move into the housing.
  • the first sleeve and the firing pin locked to the first sleeve are displaced.
  • the housing can be provided with a cross-sectional enlargement, with the inner diameter of the housing increasing in the area of the cross-sectional enlargement, with the cross-sectional enlargement being designed to partially accommodate the blocking body in the release position.
  • the cross-sectional enlargement is preferably designed in the form of a conical step, which is introduced into the inner wall of the housing. If the impaction instrument is pressed onto the implant so far that the blocking body fixed in the first sleeve reaches the area of the cross-sectional enlargement, the blocking body slides out of the recess of the firing pin and into the cross-sectional enlargement. This will release the firing pin. In this respect, the area of the cross-sectional enlargement corresponds to the release position.
  • the first sleeve can have a receptacle for the hammer on one end face, with the receptacle being designed in such a way that the firing pin makes direct contact with the hammer in the release position. This is ensures that the momentum of the accelerated firing pin can be fully transferred to the hammer.
  • the firing pin can be provided with a circumferential collar, with the first spring element being supported on the collar and on the housing. In this configuration, the first spring element is securely fixed on the firing pin.
  • a second sleeve can be arranged between the first sleeve and the housing, the inner wall of the second sleeve forming a sliding surface for the blocking body and the cross-sectional enlargement being introduced into the second sleeve.
  • the blocking body slides along the inner wall of the second sleeve.
  • the blocking body does not make contact with the inner wall of the housing.
  • the fixing position and the release position are represented by the design of the inner wall of the second sleeve and the arrangement of the blocking body relative to the second sleeve.
  • the second sleeve may be received in the housing in an axially displaceable manner and a second spring element may be provided which positions the second sleeve relative to the housing.
  • the second spring element causes the second sleeve to move so far that the opening, the locking bodies and the recess are aligned and the locking bodies thereby slide back into the recess and thus lock the firing pin to the first sleeve.
  • a third spring element can be provided, which is arranged on the face side on the first sleeve and on the housing and spaced the firing pin and the firing piece apart from one another in the fixing position.
  • the third spring element ensures that the first sleeve and the hammer are returned to the release position.
  • the housing can be provided with a handpiece.
  • the handpiece improves the usability of the impactor.
  • At least one sealing element can be arranged between the housing and the hammer.
  • a sleeve is rotatably arranged in the housing, the sleeve having at least one L-shaped opening and an inclined plane.
  • a driver engages in the opening and slides along the inclined plane when the housing is axially displaced relative to the striking piece, thereby causing the sleeve to rotate.
  • Also arranged in the sleeve is a retaining pin which is associated with the firing pin. During the axial movement of the housing, the retaining pin first slides along the horizontal section of the L-shaped opening and is released after it has reached the edge, the transition between the horizontal and vertical sections of the opening. The firing pin is accelerated in the direction of the firing pin by the spring element assigned to the firing pin and an impulse is exerted on the implant to be joined. A return spring automatically returns the components to their original position after the load has been relieved.
  • the figures show an impaction instrument 1 for joining prosthetic implants.
  • the impact instrument 1 is used in particular for joining conical press fits, which are frequently used in general in endoprosthetics.
  • the impactor is used 1 for joining joint balls to a conical clamping pin of a hip implant.
  • the impaction instrument 1 it is also conceivable for the impaction instrument 1 to be used for joining knee prostheses, shoulder prostheses or the like.
  • the impaction instrument 1 comprises a housing 2 made of metallic material, the housing 2 being provided with a through hole 22 .
  • the housing 2 accommodates a firing pin 3 , a first spring element 4 assigned to the firing pin 3 , a triggering device 5 and, in part, a firing pin 6 .
  • the striking piece 6 protrudes from the housing 2 on one end face of the housing 2 .
  • the firing pin 3, the first spring element 4 and the hammer 6 are also made of metallic material.
  • the triggering device 5 can be moved between a fixing position 8 and a release position 9 , the firing pin 3 being at a distance from the striking piece 6 in the fixing position 8 .
  • the triggering device 5 moves automatically from the fixing position 8 to the release position 9.
  • the firing pin 3 is released so that it moves accelerated by the first spring element 4 in the direction of the firing pin 6 .
  • the triggering device 5 has a first sleeve 10 which is arranged in an axially movable manner in the bore 22 of the housing 2, the first sleeve 10 receiving the firing pin 3, the first sleeve 10 having three openings 11 distributed over the circumference.
  • a blocking body 12 in the form of a metal ball is arranged in each of the openings 11 .
  • the first sleeve 10 is also made of a metallic material.
  • a recess 13 in the form of a circumferential groove is made in the firing pin 3 , the blocking bodies 12 being latched in the fixing position 8 in the recess 13 .
  • a second sleeve 17 is arranged between the first sleeve 10 and the housing 2 , the inner wall 26 of the second sleeve 17 forming a sliding surface for the blocking body 12 .
  • the blocking bodies 12 lie against the inner wall 26 of the second sleeve 17 .
  • the inner diameter of the second sleeve 17 is selected such that the locking bodies 12 are held in the openings 11 in the first sleeve 10 and in the recess 13 of the firing pin 3 so that the firing pin 3 is locked relative to the first sleeve 10 .
  • the hammer 6 moves the first sleeve 10 and the firing pin 3 locked to the first sleeve 10 relative to the housing 2 in the axial direction.
  • the striking piece 6 is displaced in the axial direction into the housing 2 .
  • the second sleeve 17 is provided with a cross-sectional widening 14 , the inner diameter of the second sleeve 17 increasing in the region of the cross-sectional widening 14 , the cross-sectional widening 14 being designed to partially accommodate the blocking body 12 in the release position 9 .
  • the blocking bodies 12 reach the area of the cross-sectional enlargement 14 in the release position 9.
  • the blocking bodies 12 slide out of the recess 13 of the firing pin 3 and into the opening 11 of the first sleeve 10 and the cross-sectional enlargement 14 of the second sleeve 17 inside.
  • the firing pin 3 is abruptly released and accelerated by the first spring element 4 in the direction of the firing pin 6 .
  • the first sleeve 10 has a receptacle 15 for the hammer piece 6 on one end face, with the receptacle 15 being designed in such a way that the firing pin 3 makes direct contact with the hammer piece 6 in the release position 9 .
  • the first sleeve 10 has an opening 25 on the end face.
  • the firing pin 3 is provided with an encircling collar 16 , the first spring element 4 being supported on the collar 16 and on the housing 2 .
  • the second sleeve 17 is accommodated in the housing 2 in an axially displaceable manner.
  • a second spring element 18 positions the second sleeve 17 relative to the housing 2.
  • a third spring element 19 is provided, which is arranged on the face side between the first sleeve 10 and the housing 2 and causes the first sleeve 10 and the hammer piece 6 to be returned in the release position 9 .
  • the housing 2 has a handpiece 20 on the end face facing away from the striking piece 6 .
  • the handpiece 20 can be made of plastic or metal.
  • a sealing element 21 is provided between the housing 2 and the striking piece 6 .
  • the hammer piece 6 On the end face facing the firing pin 3 , the hammer piece 6 has a projection which protrudes through the opening 25 made in the first sleeve 10 on the end face.
  • figure 1 shows the impact instrument 1 in the starting position.
  • the hammer 6 and the firing pin 3 are spaced apart.
  • the locking body 12 are in the opening 11 of the first sleeve 10 and in the recess 13 of the firing pin 3.
  • the locking body 12 are based on the Inner wall 26 of the second sleeve 17 from. As a result, the first sleeve 10 and the firing pin 3 are locked together.
  • FIG 2 shows the impaction instrument 1 after it has been placed on an implant part to be joined and a force has been introduced axially into the impaction instrument 1 via the handpiece 20 .
  • the hammer 6 is displaced relative to the housing 2, with the hammer 6 taking the first sleeve 10 and the locking body 12 arranged therein with it. Due to the fact that the firing pin 3 is locked to the first sleeve 10 via the locking body 12, the firing pin 3 is also displaced in the same way.
  • the cross-sectional enlargement 14 of the second sleeve 17 is reached and the blocking body 12 slide out of the recess 13 of the firing pin 3 and release the firing pin 3 .
  • the first spring element 4 was prestressed so that the hammer pin 3 is accelerated in the direction of the hammer 6 after being released by the locking body 12 sliding out of the recess 13.
  • the firing pin 3 is accelerated by the spring element 4 .
  • the accelerated firing pin 3 makes direct contact with the face of the hammer piece 6 and at high speed.
  • an impulse is introduced into the impact piece 6, which in turn is introduced via the free end 23 into the implant part to be joined.
  • the impact piece 6 has a contacting element 24 at the free end 23, which is provided with a conical depression on the side facing the implant part. This ensures at least an annular contact of the hammer 6 on the implant part to be joined. Due to the initial force required to trigger the triggering device 5, the impact instrument 1 or the Contacting element 24 of the hammer 6 with prestress on the implant part to be joined. As a result, the impulse introduced via the firing pin 3 into the striking piece 6 can be completely transmitted to the implant part to be joined. This enables a predetermined and reproducible impulse to penetrate an implant part.
  • the firing pin 3 shifts in the axial direction relative to the first sleeve 10, the second sleeve 17 and the hammer 6. In this position, the recess 13 of the firing pin 3 is shifted in the axial direction to the locking bodies 12. The locking bodies 12 remain in the opening 11 of the first sleeve 10 and in the cross-sectional enlargement 14 of the second sleeve 17.
  • the impact piece 6 moves out of the housing 2 again.
  • the spring elements 18, 19 relax, the third spring element 19 causing the first sleeve 10 to move together with the hammer 6 in the axial direction and the first sleeve 10 resting on the end face of the hammer 6.
  • the second spring element 18 in turn causes the second sleeve 17 to move so far in the opposite direction that the opening 11, the blocking bodies 12 and the recess 13 are aligned and the blocking bodies 12 slide back into the recess 13 as a result and the firing pin 3 lock with the first sleeve 10.
  • the components of the impaction instrument 1 thus move automatically into the in figure 1 shown starting position.
  • the impact instrument 1 can be used immediately for another impact. There is no need to manually preload the device or anything like that.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Transplantation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Vascular Medicine (AREA)
  • Cardiology (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Prostheses (AREA)

Description

Die Erfindung betrifft ein Einschlag-Instrument zum Fügen prothetischer Implantate, umfassend ein Gehäuse, welches einen Schlagbolzen aufnimmt, wobei dem Schlagbolzen ein erstes Federelement zugeordnet ist, wobei der Schlagbolzen mittels einer Rastvorrichtung in dem Gehäuse fixiert ist, wobei das erste Federelement den Schlagbolzen nach Lösen der Rastvorrichtung in Richtung auf ein Schlagstück beschleunigt und einen Impuls in das Schlagstück einleitet.The invention relates to an impaction instrument for joining prosthetic implants, comprising a housing which accommodates a firing pin, a first spring element being assigned to the firing pin, the firing pin being fixed in the housing by means of a locking device, the first spring element holding the firing pin after loosening the locking device accelerates in the direction of a hammer and initiates an impulse in the hammer.

Ein derartiges Einschlag-Instrument ist aus der DE 20 2006 000 845 U1 bekannt. Das Einschlag-Instrument dient vorwiegend dazu, ein Implantatteil, beispielsweise eine Gelenkkugel, auf einen konischen Klemmzapfen eines anderen Implantatteiles zu befestigen. Das aus dem Stand der Technik vorbekannte Einschlag-Instrument ermöglicht das Ausüben eines vorbestimmten Impulses, welcher nahezu ausschließlich von der Federkraft der in dem Einschlag-Instrument integrierten Feder abhängt.Such an impact instrument is from DE 20 2006 000 845 U1 known. The impact instrument is mainly used to attach an implant part, for example a joint ball, to a conical clamping pin of another implant part. The impaction instrument known from the prior art enables a predetermined impulse to be exerted, which depends almost exclusively on the spring force of the spring integrated in the impaction instrument.

Ein Problem besteht jedoch darin, dass das vorbekannte Einschlag-Instrument zunächst manuell vorgespannt werden muss. Das Auslösen erfolgt durch Drücken eines Auslöseknopfes. Danach wird zwar ein Schlagbolzen beschleunigt und übt einen vorbestimmten Impuls auf ein Schlagstück aus, dies erfolgt aber unabhängig von der Positionierung des Schlagstückes auf das zu befestigende Implantatteil. Dadurch ist nicht sicher gewährleistet, dass der von dem Schlagbolzen auf das Schlagstück ausgeübte Impuls durch das Schlagstück vollständig auf das zu fügende Implantatteil übertragen wird.One problem, however, is that the previously known impactor must first be manually pretensioned. It is triggered by pressing a release button. A firing pin is then accelerated and exerts a predetermined impulse on a striking piece, but this takes place independently of the positioning of the striking piece on the implant part to be fastened. As a result, there is no guarantee that the impulse exerted by the firing pin on the impact piece will be completely transmitted through the impact piece to the implant part to be joined.

Der Erfindung liegt die Aufgabe zugrunde, ein Einschlag-Instrument bereitzustellen, welches bei einfacher Handhabung einen reproduzierbaren Impulseintrag auf ein zu fügendes Implantatteil ermöglicht.The invention is based on the object of providing an impaction instrument which, with simple handling, enables a reproducible application of impulses to an implant part to be joined.

Diese Aufgabe wird mit den Merkmalen von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche Bezug.This object is solved with the features of claim 1. The dependent claims refer to advantageous configurations.

Das erfindungsgemäße Einschlag-Instrument zum Fügen prothetischer Implantate umfasst ein Gehäuse, welches einen Schlagbolzen, ein dem Schlagbolzen zugeordnetes erstes Federelement, eine Auslösevorrichtung und zumindest teilweise ein Schlagstück aufnimmt, wobei das Schlagstück an einer Stirnseite aus dem Gehäuse hervorsteht, wobei die Auslösevorrichtung zwischen einer Fixierposition und einer Freigabeposition beweglich ist, wobei der Schlagbolzen in der Fixierposition von dem Schlagstück beabstandet ist, wobei sich die Auslösevorrichtung bei einer axialen Bewegung des Schlagstücks in das Gehäuse hinein selbsttätig von der Fixierposition in die Freigabeposition bewegt, um nach Erreichen der Freigabeposition den Schlagbolzen freizugeben, so dass sich dieser von dem ersten Federelement beschleunigt in Richtung auf das Schlagstück bewegt.The impaction instrument according to the invention for joining prosthetic implants comprises a housing which accommodates a firing pin, a first spring element assigned to the firing pin, a triggering device and at least partially a striking piece, with the striking piece protruding from the housing on one end face, with the triggering device between a fixing position and a release position, wherein the firing pin is spaced apart from the firing pin in the fixing position, the triggering device automatically moving from the fixing position into the release position when the firing pin moves axially into the housing, in order to release the firing pin after the release position has been reached, so that it is accelerated by the first spring element in the direction of the hammer.

Dementsprechend erfolgt das Auslösen des Schlagbolzens selbsttätig in Abhängigkeit der Position des Schlagstücks relativ zu dem Gehäuse. Insbesondere ist es bei dem erfindungsgemäßen Einschlag-Instrument nicht erforderlich, dass manuell ein Auslösehebel, ein Druckknopf oder dergleichen betätigt wird. Zum Fügen prothetischer Implantate setzt der Benutzer das Schlagstück auf das zu fügende prothetische Implantat auf und bewegt das Gehäuse in axialer Richtung in Richtung auf das prothetische Implantat. Dabei bewegt sich das Schlagstück in das Gehäuse hinein, wobei die Auslösevorrichtung von der Fixierposition in die Freigabeposition bewegt wird, wobei nach Erreichen der Freigabeposition der Schlagbolzen freigegeben wird und sich beschleunigt durch das erste Federelement in Richtung auf das Schlagstück bewegt, um dort einen Impuls in das Schlagstück einzubringen. Dadurch, dass die Auslösevorrichtung nur dann in die Freigabeposition bewegt wird, wenn sich das Schlagstück in das Gehäuse hineinbewegt, ist gewährleistet, dass das Einschlag-Instrument, beziehungsweise das Schlagstück, fest und sicher auf das prothetische Implantat aufgesetzt ist. Hierbei ist vorteilhaft, dass der von dem Schlagbolzen in das Schlagstück eingebrachte Impuls vollständig von dem Schlagstück auf das prothetische Implantat übertragen wird. Die Kraft, die dabei während des Bewegens des Einschlag-Instrumentes, beziehungsweise der Auslösevorrichtung, zwischen der Fixierposition und der Freigabeposition auf das prothetische Implantat einwirkt, ist dabei stets gleich. Dadurch ist es möglich, einen reproduzierbaren Impuls in das prothetische Implantat einzubringen, wobei der Impuls genau dem zum Fügen erforderlichen Impuls entspricht.Accordingly, the firing pin is triggered automatically depending on the position of the firing piece relative to the housing. In particular, with the impaction instrument according to the invention, it is not necessary for a release lever, a push button or the like to be actuated manually. To join prosthetic implants, the user places the hammer on the prosthetic implant to be joined and moves the housing in the axial direction towards the prosthetic implant. The hammer moves into the housing, with the triggering device being moved from the fixing position to the release position, with the firing pin being released after the release position has been reached and being accelerated by the first spring element in the direction of the hammer in order to generate an impulse there to bring in the hammer. Because the trigger device is only in the release position moving as the hammer moves into the housing ensures that the impactor, or hammer, is firmly and securely seated on the prosthetic implant. It is advantageous here that the impulse introduced by the firing pin into the hammer is transmitted completely from the hammer to the prosthetic implant. The force that acts on the prosthetic implant during the movement of the impaction instrument or the triggering device between the fixing position and the release position is always the same. This makes it possible to introduce a reproducible impulse into the prosthetic implant, with the impulse corresponding exactly to the impulse required for joining.

Das erfindungsgemäße Einschlag-Instrument eignet sich somit insbesondere zum Fügen von Kegelverbindungen beziehungsweise von Kegelpressverbänden, welche insbesondere im Bereich der Endoprothetik, beispielsweise bei Hüftprothesen, häufig Verwendung finden. Dort wird eine keramische oder metallische Kugel auf einen Konus eines Hüftimplantats aufgesetzt. Bislang wird die Kugel zumeist mittels eines einzigen Hammerschlages auf dem Implantat befestigt.The impaction instrument according to the invention is therefore particularly suitable for joining cone connections or cone press fits, which are frequently used in particular in the field of endoprosthetics, for example in hip prostheses. There, a ceramic or metal ball is placed on a cone of a hip implant. So far, the ball has usually been attached to the implant with a single blow of a hammer.

Bei Befestigen des Elementes mittels eines Hammerschlages ist insbesondere problematisch, dass die Kraft des Hammerschlages nicht reproduzierbar ist. Ist der ausgeübte Impuls nicht ausreichend groß, kann es vorkommen, dass die Kugel nicht ausreichend auf dem Hüftimplantat befestigt ist. Dies kann zu Mikrobewegungen zwischen Kugel und Schaft führen, wobei Metallionen freigesetzt werden können, welche das umliegende Gewebe schädigen können. Ist der ausgeübte Impuls wiederum zu groß, kann es zu Schäden am Knochen kommen, in welchen der Schaft eingesetzt ist.When fastening the element by means of a hammer blow, it is particularly problematic that the force of the hammer blow cannot be reproduced. If the impulse exerted is not sufficiently great, it may happen that the ball is not sufficiently fastened to the hip implant. This can result in micro-movements between the ball and stem, releasing metal ions that can damage surrounding tissue. On the other hand, if the impulse exerted is too great, damage can occur to the bone in which the shaft is inserted.

Vor diesem Hintergrund ist das erfindungsgemäße Einschlag-Instrument besonders vorteilhaft, weil zum Auslösen des Einschlag-Instrumentes eine Vorspannung des Schlagstücks auf das zu befestigende Element gegeben ist. Nach Erreichen der Freigabeposition wird der Schlagbolzen schlagartig freigegeben und es wird ein Impuls mit einer sehr kurzen Impulsdauer in die Komponenten des Implantates eingebracht, um die Verbindung zu fügen.Against this background, the impact instrument according to the invention is particularly advantageous because the impact piece is prestressed on the element to be fastened in order to release the impact instrument. After reaching the release position, the firing pin will be abrupt released and an impulse with a very short impulse duration is introduced into the components of the implant in order to join the connection.

Die Auslösevorrichtung kann eine erste Hülse aufweisen, welche axial beweglich in dem Gehäuse angeordnet ist und den Schlagbolzen aufnimmt, wobei die erste Hülse am Umfang zumindest eine Durchbrechung aufweist, wobei in der Durchbrechung zumindest ein Sperrkörper angeordnet ist. Bei dieser Ausgestaltung ist die Auslösevorrichtung in dem Gehäuse aufgenommen und unmittelbar dem Schlagbolzen zugeordnet.The triggering device can have a first sleeve which is arranged in an axially movable manner in the housing and accommodates the firing pin, the first sleeve having at least one opening on the circumference, with at least one blocking body being arranged in the opening. In this embodiment, the triggering device is accommodated in the housing and assigned directly to the firing pin.

In den Schlagbolzen kann zumindest eine Vertiefung eingebracht sein, welche in der Fixierposition den Sperrkörper aufnimmt. Der in die Vertiefung aufgenommene Sperrkörper bewirkt, dass der Schlagbolzen in der Fixierposition relativ zu der ersten Hülse fixiert ist.At least one recess can be made in the firing pin, which recess accommodates the blocking body in the fixing position. The locking body accommodated in the depression causes the firing pin to be fixed in the fixing position relative to the first sleeve.

Die Vertiefung kann in Form einer umlaufenden Nut ausgebildet sein, welche in den Umfang des Schlagbolzens eingebracht ist. Eine umlaufende Nut ist einerseits einfach herstellbar und lässt andererseits Rotationsbewegungen des Schlagbolzens zu. Dadurch kann verhindert werden, dass sich der Schlagbolzen in der ersten Hülse verklemmt.The indentation can be designed in the form of a circumferential groove which is introduced into the circumference of the firing pin. On the one hand, a circumferential groove is easy to produce and, on the other hand, it allows the firing pin to rotate. This can prevent the firing pin from jamming in the first sleeve.

Der Sperrkörper kann sich in der Fixierposition an die Innenwand des Gehäuses anlegen, wobei der Innendurchmesser des Gehäuses so gewählt ist, dass der Sperrkörper in der Durchbrechung der ersten Hülse und in der Vertiefung des Schlagbolzens gehalten ist und dadurch der Schlagbolzen relativ zu der ersten Hülse verriegelt ist. Das Gehäuse weist eine Durchgangsbohrung auf, wobei der Innendurchmesser der Durchgangsbohrung bei dieser Ausgestaltung so gewählt ist, dass die erste Hülse mit ihrer Außenwand an der Innenwand der Bohrung anliegt. Dadurch sind die Sperrkörper in der Durchbrechung und in der Vertiefung des Schlagbolzens fixiert, so dass der Schlagbolzen relativ zur ersten Hülse verriegelt ist.In the fixing position, the locking body can rest against the inner wall of the housing, with the inner diameter of the housing being selected such that the locking body is held in the opening in the first sleeve and in the recess of the firing pin, thereby locking the firing pin relative to the first sleeve is. The housing has a through-bore, the inner diameter of the through-bore being selected in this embodiment such that the outer wall of the first sleeve rests against the inner wall of the bore. As a result, the locking bodies are fixed in the opening and in the recess of the firing pin, so that the firing pin is locked relative to the first sleeve.

Die Sperrkörper sind vorzugsweise in Form von Kugeln ausgebildet, wobei die erste Hülse mehrere Durchbrechungen, vorzugsweise drei über den Umfang verteilte Durchbrechungen in Form von Bohrungen, aufweist, welche die kugelförmigen Sperrkörper aufnehmen. Kugelförmige Sperrkörper sind besonders vorteilhaft, da diese an der Innenwand des Gehäuses abrollen können und nicht zum Verklemmen neigen.The blocking bodies are preferably designed in the form of balls, with the first sleeve having a plurality of openings, preferably three openings distributed over the circumference in the form of bores, which accommodate the spherical blocking bodies. Spherical blocking bodies are particularly advantageous since they can roll on the inner wall of the housing and do not tend to jam.

Das Schlagstück kann die erste Hülse und den mit der ersten Hülse verriegelten Schlagbolzen in dem Gehäuse axial verschieben, wenn sich das Schlagstück in axialer Richtung in das Gehäuse hinein verschiebt. Beim Aufsetzen des Einschlag-Instrumentes auf das zu fügende Implantat wird eine Kraft in das Einschlag-Instrument eingebracht, wodurch sich das Schlagstück in das Gehäuse hinein verschiebt. Gleichzeitig verschieben sich damit die erste Hülse und der mit der ersten Hülse verriegelte Schlagbolzen.The hammer can axially displace the first sleeve and the firing pin locked to the first sleeve within the housing as the hammer translates axially into the housing. When the impaction instrument is placed on the implant to be joined, a force is applied to the impaction instrument, causing the impact piece to move into the housing. At the same time, the first sleeve and the firing pin locked to the first sleeve are displaced.

Das Gehäuse kann mit einer Querschnittserweiterung versehen sein, wobei sich der Innendurchmesser des Gehäuses im Bereich der Querschnittserweiterung vergrößert, wobei die Querschnittserweiterung zur teilweisen Aufnahme des Sperrkörpers in der Freigabeposition ausgebildet ist.The housing can be provided with a cross-sectional enlargement, with the inner diameter of the housing increasing in the area of the cross-sectional enlargement, with the cross-sectional enlargement being designed to partially accommodate the blocking body in the release position.

Die Querschnittserweiterung ist vorzugsweise in Form einer kegelförmigen Stufe ausgebildet, welche in die Innenwand des Gehäuses eingebracht ist. Wird das Einschlag-Instrument so weit auf das Implantat aufgedrückt, dass der in der ersten Hülse fixierte Sperrkörper den Bereich der Querschnittserweiterung erreicht, gleitet der Sperrkörper aus der Vertiefung des Schlagbolzens heraus und in die Querschnittserweiterung hinein. Dadurch wird der Schlagbolzen freigegeben. Insofern entspricht der Bereich der Querschnittserweiterung der Freigabeposition.The cross-sectional enlargement is preferably designed in the form of a conical step, which is introduced into the inner wall of the housing. If the impaction instrument is pressed onto the implant so far that the blocking body fixed in the first sleeve reaches the area of the cross-sectional enlargement, the blocking body slides out of the recess of the firing pin and into the cross-sectional enlargement. This will release the firing pin. In this respect, the area of the cross-sectional enlargement corresponds to the release position.

Die erste Hülse kann auf einer Stirnseite eine Aufnahme für das Schlagstück aufweisen, wobei die Aufnahme so ausgebildet ist, dass der Schlagbolzen in der Freigabeposition das Schlagstück unmittelbar kontaktiert. Dadurch ist sichergestellt, dass der Impuls des beschleunigten Schlagbolzens vollständig in das Schlagstück übertragen werden kann.The first sleeve can have a receptacle for the hammer on one end face, with the receptacle being designed in such a way that the firing pin makes direct contact with the hammer in the release position. This is ensures that the momentum of the accelerated firing pin can be fully transferred to the hammer.

Der Schlagbolzen kann mit einem umlaufenden Kragen versehen sein, wobei sich das erste Federelement an dem Kragen und an dem Gehäuse abstützt. Bei dieser Ausgestaltung ist das erste Federelement sicher auf dem Schlagbolzen fixiert.The firing pin can be provided with a circumferential collar, with the first spring element being supported on the collar and on the housing. In this configuration, the first spring element is securely fixed on the firing pin.

Zwischen der ersten Hülse und dem Gehäuse kann eine zweite Hülse angeordnet sein, wobei die Innenwand der zweiten Hülse eine Gleitfläche für den Sperrkörper bildet und wobei die Querschnittserweiterung in die zweite Hülse eingebracht ist. Bei dieser Ausgestaltung gleitet der Sperrkörper an der Innenwand der zweiten Hülse entlang. Der Sperrkörper kontaktiert dabei insbesondere nicht die Innenwand des Gehäuses. Die Fixierposition und die Freigabeposition sind dabei durch die Ausgestaltung der Innenwand der zweiten Hülse und die Anordnung der Sperrkörper relativ zur zweiten Hülse repräsentiert.A second sleeve can be arranged between the first sleeve and the housing, the inner wall of the second sleeve forming a sliding surface for the blocking body and the cross-sectional enlargement being introduced into the second sleeve. In this configuration, the blocking body slides along the inner wall of the second sleeve. In particular, the blocking body does not make contact with the inner wall of the housing. The fixing position and the release position are represented by the design of the inner wall of the second sleeve and the arrangement of the blocking body relative to the second sleeve.

Die zweite Hülse kann axial verschieblich in dem Gehäuse aufgenommen sein und ein zweites Federelement kann vorgesehen sein, welches die zweite Hülse relativ zu dem Gehäuse positioniert. Das zweite Federelement bewirkt, dass sich die zweite Hülse so weit bewegt, dass die Durchbrechung, die Sperrkörper und die Vertiefung fluchten und dadurch die Sperrkörper wieder in die Vertiefung hineingleiten und so den Schlagbolzen mit der ersten Hülse verriegeln.The second sleeve may be received in the housing in an axially displaceable manner and a second spring element may be provided which positions the second sleeve relative to the housing. The second spring element causes the second sleeve to move so far that the opening, the locking bodies and the recess are aligned and the locking bodies thereby slide back into the recess and thus lock the firing pin to the first sleeve.

Es kann ein drittes Federelement vorgesehen sein, welches stirnseitig an der ersten Hülse und an dem Gehäuse angeordnet ist und in der Fixierposition den Schlagbolzen und das Schlagstück voneinander beabstandet. Das dritte Federelement stellt sicher, dass die erste Hülse und das Schlagstück in die Freigabeposition zurückgeführt werden.A third spring element can be provided, which is arranged on the face side on the first sleeve and on the housing and spaced the firing pin and the firing piece apart from one another in the fixing position. The third spring element ensures that the first sleeve and the hammer are returned to the release position.

Das Gehäuse kann mit einem Handstück versehen sein. Das Handstück verbessert die Bedienbarkeit des Einschlag-Instrumentes.The housing can be provided with a handpiece. The handpiece improves the usability of the impactor.

Zwischen Gehäuse und Schlagstück kann zumindest ein Dichtelement angeordnet sein.At least one sealing element can be arranged between the housing and the hammer.

Gemäß einer alternativen Ausgestaltung ist in dem Gehäuse eine Hülse drehbar angeordnet, wobei die Hülse zumindest eine L-förmige Durchbrechung und eine schräge Ebene aufweist. In die Durchbrechung greift ein Mitnehmer ein, welcher beim axialen Verschieben des Gehäuses relativ zu dem Schlagstück an der schiefen Ebene entlanggleitet und dadurch ein Verdrehen der Hülse bewirkt. In der Hülse ist ferner ein Haltestift angeordnet, welcher dem Schlagbolzen zugeordnet ist. Der Haltestift gleitet bei der Axialbewegung des Gehäuses zunächst an dem horizontalen Abschnitt der L-förmigen Durchbrechung entlang und wird nach Erreichen der Kante, dem Übergang zwischen horizontalem und vertikalem Abschnitt der Durchbrechung, freigegeben. Dabei wird der Schlagbolzen durch das dem Schlagbolzen zugeordnete Federelement in Richtung auf das Schlagstück beschleunigt und ein Impuls wird auf das zu fügende Implantat ausgeübt. Eine Rückstellfeder bringt die Komponenten nach dem Entlasten selbsttätig in die Ausgangsposition zurück.According to an alternative embodiment, a sleeve is rotatably arranged in the housing, the sleeve having at least one L-shaped opening and an inclined plane. A driver engages in the opening and slides along the inclined plane when the housing is axially displaced relative to the striking piece, thereby causing the sleeve to rotate. Also arranged in the sleeve is a retaining pin which is associated with the firing pin. During the axial movement of the housing, the retaining pin first slides along the horizontal section of the L-shaped opening and is released after it has reached the edge, the transition between the horizontal and vertical sections of the opening. The firing pin is accelerated in the direction of the firing pin by the spring element assigned to the firing pin and an impulse is exerted on the implant to be joined. A return spring automatically returns the components to their original position after the load has been relieved.

Einige Ausgestaltungen des erfindungsgemäßen Einschlag-Instrumentes werden nachfolgend anhand der Figuren näher erläutert. Die Figuren zeigen, jeweils schematisch:

  • Fig. 1 im Schnitt das Einschlag-Instrument in der Fixierposition;
  • Fig. 2 im Schnitt das Einschlag-Instrument in der Freigabeposition.
Some configurations of the impaction instrument according to the invention are explained in more detail below with reference to the figures. The figures show, each schematically:
  • 1 in section the impactor in the fixation position;
  • 2 in section the impactor in the release position.

Die Figuren zeigen ein Einschlag-Instrument 1 zum Fügen prothetischer Implantate. Das Einschlag-Instrument 1 dient insbesondere dem Fügen von Kegelpressverbänden, welche allgemein in der Endoprothetik häufig Anwendung finden. Bei der vorliegenden Ausgestaltung dient das Einschlag-Instrument 1 zum Fügen von Gelenkkugeln auf einen konischen Klemmzapfen eines Hüftimplantats. Es ist aber auch denkbar, dass das Einschlag-Instrument 1 zum Fügen von Knieprothesen, Schulterprothesen oder dergleichen zum Einsatz gelangt.The figures show an impaction instrument 1 for joining prosthetic implants. The impact instrument 1 is used in particular for joining conical press fits, which are frequently used in general in endoprosthetics. In the present embodiment, the impactor is used 1 for joining joint balls to a conical clamping pin of a hip implant. However, it is also conceivable for the impaction instrument 1 to be used for joining knee prostheses, shoulder prostheses or the like.

Das Einschlag-Instrument 1 umfasst ein Gehäuse 2 aus metallischem Werkstoff, wobei das Gehäuse 2 mit einer Durchgangsbohrung 22 versehen ist. Das Gehäuse 2 nimmt einen Schlagbolzen 3, ein dem Schlagbolzen 3 zugeordnetes erstes Federelement 4, eine Auslösevorrichtung 5 und teilweise ein Schlagstück 6 auf. Das Schlagstück 6 ragt an einer Stirnseite des Gehäuses 2 aus dem Gehäuse 2 heraus.The impaction instrument 1 comprises a housing 2 made of metallic material, the housing 2 being provided with a through hole 22 . The housing 2 accommodates a firing pin 3 , a first spring element 4 assigned to the firing pin 3 , a triggering device 5 and, in part, a firing pin 6 . The striking piece 6 protrudes from the housing 2 on one end face of the housing 2 .

Der Schlagbolzen 3, das erste Federelement 4 und das Schlagstück 6 sind ebenfalls aus metallischem Werkstoff ausgebildet.The firing pin 3, the first spring element 4 and the hammer 6 are also made of metallic material.

Die Auslösevorrichtung 5 ist zwischen einer Fixierposition 8 und einer Freigabeposition 9 beweglich, wobei der Schlagbolzen 3 in der Fixierposition 8 von dem Schlagstück 6 beabstandet ist. Bei einer axialen Bewegung des Schlagstücks 6 in das Gehäuse 2 hinein bewegt sich die Auslösevorrichtung 5 selbsttätig von der Fixierposition 8 in die Freigabeposition 9.The triggering device 5 can be moved between a fixing position 8 and a release position 9 , the firing pin 3 being at a distance from the striking piece 6 in the fixing position 8 . When the hammer 6 moves axially into the housing 2, the triggering device 5 moves automatically from the fixing position 8 to the release position 9.

Nach Erreichen der Freigabeposition 9 ist der Schlagbolzen 3 freigegeben, so dass sich dieser von dem ersten Federelement 4 beschleunigt in Richtung auf das Schlagstück 6 bewegt.After the release position 9 has been reached, the firing pin 3 is released so that it moves accelerated by the first spring element 4 in the direction of the firing pin 6 .

Die Auslösevorrichtung 5 weist eine erste Hülse 10 auf, welche axial beweglich in der Bohrung 22 des Gehäuses 2 angeordnet ist, wobei die erste Hülse 10 den Schlagbolzen 3 aufnimmt, wobei die erste Hülse 10 über den Umfang verteilt drei Durchbrechungen 11 aufweist. In den Durchbrechungen 11 ist jeweils ein Sperrkörper 12 in Form einer Metallkugel angeordnet. Die erste Hülse 10 besteht ebenfalls aus metallischem Werkstoff.The triggering device 5 has a first sleeve 10 which is arranged in an axially movable manner in the bore 22 of the housing 2, the first sleeve 10 receiving the firing pin 3, the first sleeve 10 having three openings 11 distributed over the circumference. A blocking body 12 in the form of a metal ball is arranged in each of the openings 11 . The first sleeve 10 is also made of a metallic material.

In den Schlagbolzen 3 ist eine Vertiefung 13 in Form einer umlaufenden Nut eingebracht, wobei die Sperrkörper 12 in der Fixierposition 8 in der Vertiefung 13 verrastet sind.A recess 13 in the form of a circumferential groove is made in the firing pin 3 , the blocking bodies 12 being latched in the fixing position 8 in the recess 13 .

Zwischen der ersten Hülse 10 und dem Gehäuse 2 ist eine zweite Hülse 17 angeordnet, wobei die Innenwand 26 der zweiten Hülse 17 eine Gleitfläche für die Sperrkörper 12 bildet. In der Fixierposition 8 legen sich die Sperrkörper 12 an die Innenwand 26 der zweiten Hülse 17 an. Dabei ist der Innendurchmesser der zweiten Hülse 17 so gewählt, dass die Sperrkörper 12 in den Durchbrechungen 11 der ersten Hülse 10 und in der Vertiefung 13 des Schlagbolzens 3 gehalten sind, so dass der Schlagbolzen 3 relativ zu der ersten Hülse 10 verriegelt ist.A second sleeve 17 is arranged between the first sleeve 10 and the housing 2 , the inner wall 26 of the second sleeve 17 forming a sliding surface for the blocking body 12 . In the fixing position 8 the blocking bodies 12 lie against the inner wall 26 of the second sleeve 17 . The inner diameter of the second sleeve 17 is selected such that the locking bodies 12 are held in the openings 11 in the first sleeve 10 and in the recess 13 of the firing pin 3 so that the firing pin 3 is locked relative to the first sleeve 10 .

Wird das Einschlag-Instrument 1 auf ein zu fügendes Implantat aufgesetzt und eine Kraft auf das Einschlag-Instrument 1 ausgeübt, verschiebt das Schlagstück 6 die erste Hülse 10 und den mit der ersten Hülse 10 verriegelten Schlagbolzen 3 relativ zu dem Gehäuse 2 in axialer Richtung. Das Schlagstück 6 verschiebt sich dabei in axialer Richtung in das Gehäuse 2 hinein.If the impaction instrument 1 is placed on an implant to be joined and a force is exerted on the impaction instrument 1, the hammer 6 moves the first sleeve 10 and the firing pin 3 locked to the first sleeve 10 relative to the housing 2 in the axial direction. The striking piece 6 is displaced in the axial direction into the housing 2 .

Die zweite Hülse 17 ist mit einer Querschnittserweiterung 14 versehen, wobei sich der Innendurchmesser der zweiten Hülse 17 im Bereich der Querschnittserweiterung 14 vergrößert, wobei die Querschnittserweiterung 14 zur teilweisen Aufnahme der Sperrkörper 12 in der Freigabeposition 9 ausgebildet ist.The second sleeve 17 is provided with a cross-sectional widening 14 , the inner diameter of the second sleeve 17 increasing in the region of the cross-sectional widening 14 , the cross-sectional widening 14 being designed to partially accommodate the blocking body 12 in the release position 9 .

Wird das Schlagstück 6 so weit axial in das Gehäuse 2 hinein verschoben, erreichen die Sperrkörper 12 in der Freigabeposition 9 den Bereich der Querschnittserweiterung 14. Dabei gleiten die Sperrkörper 12 aus der Vertiefung 13 des Schlagbolzens 3 heraus und in die Durchbrechung 11 der ersten Hülse 10 und die Querschnittserweiterung 14 der zweiten Hülse 17 hinein. Dadurch wird der Schlagbolzen 3 schlagartig freigegeben und durch das erste Federelement 4 in Richtung auf das Schlagstück 6 beschleunigt.If the hammer 6 is pushed so far axially into the housing 2, the blocking bodies 12 reach the area of the cross-sectional enlargement 14 in the release position 9. The blocking bodies 12 slide out of the recess 13 of the firing pin 3 and into the opening 11 of the first sleeve 10 and the cross-sectional enlargement 14 of the second sleeve 17 inside. As a result, the firing pin 3 is abruptly released and accelerated by the first spring element 4 in the direction of the firing pin 6 .

Die erste Hülse 10 weist auf einer Stirnseite eine Aufnahme 15 für das Schlagstück 6 auf, wobei die Aufnahme 15 so ausgebildet ist, dass der Schlagbolzen 3 in der Freigabeposition 9 das Schlagstück 6 unmittelbar kontaktiert. Dazu weist die erste Hülse 10 auf der Stirnseite eine Durchbrechung 25 auf.The first sleeve 10 has a receptacle 15 for the hammer piece 6 on one end face, with the receptacle 15 being designed in such a way that the firing pin 3 makes direct contact with the hammer piece 6 in the release position 9 . For this purpose, the first sleeve 10 has an opening 25 on the end face.

Der Schlagbolzen 3 ist mit einem umlaufenden Kragen 16 versehen, wobei sich das erste Federelement 4 an dem Kragen 16 und an dem Gehäuse 2 abstützt.The firing pin 3 is provided with an encircling collar 16 , the first spring element 4 being supported on the collar 16 and on the housing 2 .

Die zweite Hülse 17 ist axial verschieblich in dem Gehäuse 2 aufgenommen. Ein zweites Federelement 18 positioniert die zweite Hülse 17 relativ zu dem Gehäuse 2.The second sleeve 17 is accommodated in the housing 2 in an axially displaceable manner. A second spring element 18 positions the second sleeve 17 relative to the housing 2.

Des Weiteren ist ein drittes Federelement 19 vorgesehen, welches stirnseitig zwischen der ersten Hülse 10 und dem Gehäuse 2 angeordnet ist und bewirkt, dass in der Freigabeposition 9 die erste Hülse 10 und das Schlagstück 6 zurückgeführt werden.Furthermore, a third spring element 19 is provided, which is arranged on the face side between the first sleeve 10 and the housing 2 and causes the first sleeve 10 and the hammer piece 6 to be returned in the release position 9 .

Das Gehäuse 2 weist an der dem Schlagstück 6 abgewandten Stirnseite ein Handstück 20 auf. Das Handstück 20 kann aus Kunststoff oder Metall ausgebildet sein.The housing 2 has a handpiece 20 on the end face facing away from the striking piece 6 . The handpiece 20 can be made of plastic or metal.

Zwischen Gehäuse 2 und Schlagstück 6 ist ein Dichtelement 21 vorgesehen.A sealing element 21 is provided between the housing 2 and the striking piece 6 .

Das Schlagstück 6 weist auf der dem Schlagbolzen 3 zugewandten Stirnseite einen Vorsprung auf, welcher durch die in die erste Hülse 10 stirnseitig eingebrachte Durchbrechung 25 hindurchragt.On the end face facing the firing pin 3 , the hammer piece 6 has a projection which protrudes through the opening 25 made in the first sleeve 10 on the end face.

Figur 1 zeigt das Einschlag-Instrument 1 in der Ausgangsstellung. Dabei sind das Schlagstück 6 und der Schlagbolzen 3 voneinander beabstandet. Die Sperrkörper 12 liegen in der Durchbrechung 11 der ersten Hülse 10 und in der Vertiefung 13 des Schlagbolzens 3. Die Sperrkörper 12 stützen sich an der Innenwand 26 der zweiten Hülse 17 ab. Dadurch sind die erste Hülse 10 und der Schlagbolzen 3 miteinander verriegelt. figure 1 shows the impact instrument 1 in the starting position. The hammer 6 and the firing pin 3 are spaced apart. The locking body 12 are in the opening 11 of the first sleeve 10 and in the recess 13 of the firing pin 3. The locking body 12 are based on the Inner wall 26 of the second sleeve 17 from. As a result, the first sleeve 10 and the firing pin 3 are locked together.

Figur 2 zeigt das Einschlag-Instrument 1, nachdem dieses auf ein zu fügendes Implantatteil aufgesetzt wurde und über das Handstück 20 eine Kraft axial in das Einschlag-Instrument 1 eingebracht wurde. Durch das Einbringen der Kraft in axialer Richtung verschiebt sich das Schlagstück 6 relativ zu dem Gehäuse 2, wobei das Schlagstück 6 die erste Hülse 10 und die darin angeordneten Sperrkörper 12 mitnimmt. Dadurch, dass der Schlagbolzen 3 über die Sperrkörper 12 mit der ersten Hülse 10 verriegelt ist, verschiebt sich auch der Schlagbolzen 3 gleichermaßen. figure 2 shows the impaction instrument 1 after it has been placed on an implant part to be joined and a force has been introduced axially into the impaction instrument 1 via the handpiece 20 . By introducing the force in the axial direction, the hammer 6 is displaced relative to the housing 2, with the hammer 6 taking the first sleeve 10 and the locking body 12 arranged therein with it. Due to the fact that the firing pin 3 is locked to the first sleeve 10 via the locking body 12, the firing pin 3 is also displaced in the same way.

Bei der in Figur 2 gezeigten Position ist die Querschnittserweiterung 14 der zweiten Hülse 17 erreicht und die Sperrkörper 12 gleiten aus der Vertiefung 13 des Schlagbolzens 3 heraus und geben den Schlagbolzen 3 frei. Durch das Verschieben des Schlagstückes 6, der ersten Hülse 10 und des Schlagbolzens 3 wurde das erste Federelement 4 vorgespannt, so dass der Schlagbolzen 3 nach Freigabe durch die aus der Vertiefung 13 herausgeglittenen Sperrkörper 12 in Richtung auf das Schlagstück 6 beschleunigt wird.At the in figure 2 shown position, the cross-sectional enlargement 14 of the second sleeve 17 is reached and the blocking body 12 slide out of the recess 13 of the firing pin 3 and release the firing pin 3 . By moving the hammer 6, the first sleeve 10 and the hammer pin 3, the first spring element 4 was prestressed so that the hammer pin 3 is accelerated in the direction of the hammer 6 after being released by the locking body 12 sliding out of the recess 13.

Nach dem Auslösen wird der Schlagbolzens 3 durch das Federelement 4 beschleunigt. Der beschleunigte Schlagbolzen 3 kontaktiert das Schlagstück 6 stirnseitig unmittelbar und mit hoher Geschwindigkeit. Zusammen mit der für das Auslösen der Auslösevorrichtung 5 benötigten Vorkraft wird ein Impuls in das Schlagstück 6 eingebracht, welcher wiederum über das freie Ende 23 in das zu fügende Implantatteil eingebracht wird. Zur besseren Kontaktierung des Implantatteiles weist das Schlagstück 6 an dem freien Ende 23 ein Kontaktierelement 24 auf, welches auf der dem Implantatteil zugewandten Seite mit einer kegelförmigen Vertiefung versehen ist. Damit ist zumindest eine ringförmige Anlage des Schlagstückes 6 an dem zu fügenden Implantatteil gewährleistet. Durch die zum Auslösen der Auslösevorrichtung 5 erforderliche Vorkraft liegt das Einschlag-Instrument 1 beziehungsweise das Kontaktierelement 24 des Schlagstückes 6 mit Vorspannung an dem zu fügenden Implantatteil auf. Dadurch kann der über den Schlagbolzen 3 in das Schlagstück 6 eingebrachte Impuls vollständig auf das zu fügende Implantatteil übertragen werden. Dies ermöglicht das Eindringen eines vorbestimmten und reproduzierbaren Impulses in ein Implantatteil.After triggering, the firing pin 3 is accelerated by the spring element 4 . The accelerated firing pin 3 makes direct contact with the face of the hammer piece 6 and at high speed. Together with the preliminary force required to trigger the triggering device 5, an impulse is introduced into the impact piece 6, which in turn is introduced via the free end 23 into the implant part to be joined. For better contacting of the implant part, the impact piece 6 has a contacting element 24 at the free end 23, which is provided with a conical depression on the side facing the implant part. This ensures at least an annular contact of the hammer 6 on the implant part to be joined. Due to the initial force required to trigger the triggering device 5, the impact instrument 1 or the Contacting element 24 of the hammer 6 with prestress on the implant part to be joined. As a result, the impulse introduced via the firing pin 3 into the striking piece 6 can be completely transmitted to the implant part to be joined. This enables a predetermined and reproducible impulse to penetrate an implant part.

Während des Beschleunigens des Schlagbolzens 3 verschiebt sich der Schlagbolzen 3 in axialer Richtung relativ zu der ersten Hülse 10, der zweiten Hülse 17 und dem Schlagstück 6. In dieser Position ist die Vertiefung 13 des Schlagbolzens 3 in axialer Richtung zu den Sperrkörpern 12 verschoben. Die Sperrkörper 12 verharren in der Durchbrechung 11 der ersten Hülse 10 und in der Querschnittserweiterung 14 der zweiten Hülse 17.During the acceleration of the firing pin 3, the firing pin 3 shifts in the axial direction relative to the first sleeve 10, the second sleeve 17 and the hammer 6. In this position, the recess 13 of the firing pin 3 is shifted in the axial direction to the locking bodies 12. The locking bodies 12 remain in the opening 11 of the first sleeve 10 and in the cross-sectional enlargement 14 of the second sleeve 17.

Wird nun das Einschlag-Instrument 1 entlastet, bewegt sich das Schlagstück 6 wieder aus dem Gehäuse 2 heraus. Dabei entspannen sich die Federelemente 18, 19, wobei das dritte Federelement 19 bewirkt, dass sich die erste Hülse 10 gemeinsam mit dem Schlagstück 6 in axialer Richtung bewegt und dabei die erste Hülse 10 an der Stirnseite des Schlagstücks 6 anliegt. Das zweite Federelement 18 wiederum bewirkt, dass sich die zweite Hülse 17 so weit in die entgegengesetzte Richtung bewegt, dass die Durchbrechung 11, die Sperrkörper 12 und die Vertiefung 13 fluchten und dadurch die Sperrkörper 12 wieder in die Vertiefung 13 hineingleiten und so den Schlagbolzen 3 mit der ersten Hülse 10 verriegeln.If the impact instrument 1 is now relieved, the impact piece 6 moves out of the housing 2 again. The spring elements 18, 19 relax, the third spring element 19 causing the first sleeve 10 to move together with the hammer 6 in the axial direction and the first sleeve 10 resting on the end face of the hammer 6. The second spring element 18 in turn causes the second sleeve 17 to move so far in the opposite direction that the opening 11, the blocking bodies 12 and the recess 13 are aligned and the blocking bodies 12 slide back into the recess 13 as a result and the firing pin 3 lock with the first sleeve 10.

Somit bewegen sich die Komponenten des Einschlag-Instrumentes 1 nach Ausüben des Schlages und dem Entlasten selbsttätig in die in Figur 1 gezeigte Ausgangsstellung zurück. Das Einschlag-Instrument 1 kann unmittelbar für einen weiteren Schlag eingesetzt werden. Es ist nicht erforderlich, das Gerät manuell vorzuspannen oder dergleichen.The components of the impaction instrument 1 thus move automatically into the in figure 1 shown starting position. The impact instrument 1 can be used immediately for another impact. There is no need to manually preload the device or anything like that.

Claims (15)

  1. Tap-in instrument (1) for joining prosthetic implants, comprising a housing (2), which receives a firing pin (3), a first spring element (4) assigned to the firing pin (3) and, at least in part, a striker (6), the striker (6) protruding from the housing (2) at an end face (7), characterised in that the housing (2) receives a trigger device (5), the trigger device (5) being movable between a fixing position (8) and a release position (9), the firing pin (3) being spaced apart from the striker (6) in the fixing position (8), the trigger device (5) moving from the fixing position (8) into the release position (9) automatically upon an axial movement of the striker (6) into the housing (2), so as to release the firing pin (3) after reaching the release position (9), in such a way that said pin moves towards the striker (6), accelerated by the first spring element (4).
  2. Tap-in instrument according to claim 1, characterised in that when the tap-in instrument (1) is placed in an axial direction on an implant to be joined the housing (2) moves towards the implant, the striker (6) moving into the housing (2) and from the fixing position (8) into the release position (9), the firing pin (3) being released once the striker (6) reaches the release position (9), and the firing pin (3), accelerated by the first spring element (4), moving towards the striker (6) to introduce an impulse into the striker (6).
  3. Tap-in instrument according to either claim 1 or claim 2, characterised in that the trigger device (5) has a first sleeve (10), which is arranged axially movably in the housing (2) and receives the striker pin (3), the first sleeve (10) having on the circumference at least one clearance (11), at least one blocking body (12) being arranged in the clearance (11).
  4. Tap-in instrument according to claim 3, characterised in that at least one depression (13) is formed in the firing pin (3) and receives the blocking body (12) in the fixing position (8).
  5. Tap-in instrument according to claim 4, characterised in that the depression (13) is in the form of a circumferential groove formed in the circumference of the firing pin (3).
  6. Tap-in instrument according to either claim 4 or claim 5, characterised in that the blocking body (12) is positioned against the inner wall (26) of the housing (2) in the fixing position (8), the internal diameter of the housing (2) being selected in such a way that the blocking body (12) is held in the clearance (11) of the first sleeve (10) and in the depression (13) of the firing pin (3) and the firing pin (3) is thus locked relative to the first sleeve (10).
  7. Tap-in instrument according to claim 6, characterised in that the striker (6) axially displaces the first sleeve (10) and the firing pin (3) locked to the first sleeve (10) in the housing (2) when the firing pin (6) is displaced into the housing (2) in an axial direction.
  8. Tap-in instrument according to any of claims 3 to 6, characterised in that the housing (2) is provided with a cross-sectional extension (14), the internal diameter of the housing (2) increasing in the region of the cross-sectional extension (14), the cross-sectional extension (14) being formed to receive the blocking body (12) in part in the release position (9).
  9. Tap-in instrument according to claim 8, characterised in that in the release position (9) the blocking body (12) slides out of the depression (13) in the firing pin (3), into the clearance (11) in the first sleeve (10) and into the cross-sectional extension (14) of the housing (2), in such a way that the firing pin (3) is released.
  10. Tap-in instrument according to any of claims 3 to 9, characterised in that the first sleeve (10) has a recess (15) for the striker (6) on an end face, the recess (15) being formed in such a way that the firing pin (3) directly contacts the striker (6) in the release position (9).
  11. Tap-in instrument according to any of claims 1 to 10, characterised in that the firing pin (3) is provided with a circumferential collar (16), the first spring element (4) being braced on the collar (16) and on the housing (2).
  12. Tap-in instrument according to any of claims 3 to 11, characterised in that a second sleeve (17) is arranged between the first sleeve (10) and the housing (2), the inner wall (26) of the second sleeve (17) forming a sliding face for the blocking body (12), and the cross-sectional extension (14) being formed in the second sleeve (17).
  13. Tap-in instrument according to claim 12, characterised in that the second sleeve (17) is received axially displaceably in the housing (2), and a second spring element (18) is provided, which positions the second sleeve (17) relative to the housing (2).
  14. Tap-in instrument according to any of claims 3 to 13, characterised in that a third spring element (19) is provided, which is arranged at the end face between the first sleeve (10) and the housing (2).
  15. Tap-in instrument according to any of claims 1 to 14, characterised in that the housing (2) is provided with a handpiece (20).
EP19786747.6A 2018-10-11 2019-10-08 Tap-in instrument Active EP3863569B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018125190.4A DE102018125190B4 (en) 2018-10-11 2018-10-11 Impact instrument for joining prosthetic implants
PCT/EP2019/077203 WO2020074501A1 (en) 2018-10-11 2019-10-08 Drive-in instrument

Publications (2)

Publication Number Publication Date
EP3863569A1 EP3863569A1 (en) 2021-08-18
EP3863569B1 true EP3863569B1 (en) 2023-04-19

Family

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Application Number Title Priority Date Filing Date
EP19786747.6A Active EP3863569B1 (en) 2018-10-11 2019-10-08 Tap-in instrument

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US (1) US11806251B2 (en)
EP (1) EP3863569B1 (en)
KR (1) KR20210091708A (en)
CN (1) CN113164262A (en)
BR (1) BR112021006518A2 (en)
DE (1) DE102018125190B4 (en)
WO (1) WO2020074501A1 (en)

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DE102022118986A1 (en) 2022-07-28 2024-02-08 Aesculap Ag Medical percussion instrument

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US2787178A (en) * 1955-10-25 1957-04-02 Maxim George Axially projectable impact tool
NL237357A (en) * 1958-03-27
US3385380A (en) * 1966-10-20 1968-05-28 Vare Corp Tang breakoff tool having spring actuated impact means
US5632765A (en) * 1995-02-07 1997-05-27 Holder; Jack M. Chiropractic device for removing a vertebral subluxation
FR2814061B1 (en) 2000-09-21 2003-02-21 Sulzer Orthopedie S A IMPACTOR FOR THE ORTHOPEDIC AREA
US20050187562A1 (en) * 2004-02-03 2005-08-25 Grimm James E. Orthopaedic component inserter for use with a surgical navigation system
US7708739B2 (en) * 2005-03-31 2010-05-04 Depuy Products, Inc. Controlled force impacting device
DE202006000845U1 (en) 2006-01-17 2006-04-13 Eska Implants Gmbh & Co. Setting instrument for making conical joint between modular parts has casing, driving piston with piston rod, tensioning device and actuating device whereby at second end of driving piston, an impulse directing device is arranged
US7621921B2 (en) * 2006-01-25 2009-11-24 Symmetry Medical, Inc Split thread orthopaedic implant impactor
NZ548878A (en) * 2006-08-01 2008-11-28 Enztec Ltd Improved impactor
ES2394197T3 (en) * 2008-10-31 2013-01-23 Ferton Holding Sa Instrument for generating pressure waves as a shock wave for the treatment of biological tissue
US8650988B2 (en) * 2011-08-05 2014-02-18 Chao-Chin Yen Hand tool having multiple switchable functions
US9005213B2 (en) 2012-11-16 2015-04-14 DePuy Synthes Products, Inc. Controlled force surgical implant impaction instrument
US20150094728A1 (en) 2013-09-30 2015-04-02 DePuy Synthes Products, LLC Instrument for positioning a cup component of an orthopaedic joint prosthesis
FR3040290B1 (en) 2015-09-02 2022-01-14 Xnov Ip IMPACTOR DEVICE TO APPLY A SHOCK TO A ROD
DE102016101900B4 (en) 2016-02-03 2023-01-12 Universität Rostock Instrument for placing an implant
KR102371305B1 (en) * 2016-08-31 2022-03-08 메디컬 엔터프라이시스 디스트리부션 엘엘씨 Orthopedic Devices Delivering Controlled, Repeatable Impacts

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DE102018125190A1 (en) 2020-04-16
CN113164262A (en) 2021-07-23
DE102018125190B4 (en) 2021-09-02
US20210378840A1 (en) 2021-12-09
BR112021006518A2 (en) 2021-07-06
WO2020074501A1 (en) 2020-04-16
EP3863569A1 (en) 2021-08-18
KR20210091708A (en) 2021-07-22
US11806251B2 (en) 2023-11-07

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